i think harry himself is the last horcrux. if you think about how all this started, voldemort had just killed his parents, which makes him ripe for horcrux making. then he, eventually mistakenly, tries to kill harry, which backfires. i think that, along with the fact that harry was protected by his mother's love, was the point that harry became a horcrux. Voldemort was warned that making too many horcruxes could be dangerous, and he found out just how dangerous.
when harry gets older, dumbledore explains that voldemort put a bit of himself into harry, which is how one makes a horcrux. this was obviously done by mistake, because voldemort was just as surprised as anyone else.
as for the scar, my theory is that, since harry may be the only horcrux that is actually alive, it serves as a sort of connection between voldemort and the part of his soul that's in harry. that, of course would explain harry’s visions and almost psychic connection with voldemort.
in the end, i'm sorry to say, harry will of course have to sacrifice himself to make sure that voldemort doesn't come back. therefore, voldemort and harry will have to die at the same time, unless harry comes up with or somebody informs him of a major loop hole.
well, that's my theory, anyway. obviously i've had lots of time to actually think about this. let me know what you all think.
Originally posted by zombieman
Yeah, but doesn't Voldemort have to be the one who has done the killing to create a Horcrux? Also, I trust Dumbledores intuition, that the final Horcrux is an item belonging to Ravenclaw or Griffindor.
One of me friend thinks it is Harry's scar, which could be true, but highly unlikely. If it was Harry's scar, he would have to kill himself before killing Voldemort, and that's impossible.
So Voldemort has his snake, the locket, the cup, the diary, and possible the arm. I doubt that the cup used to transport Cedric and Harry to Voldemort would be one, seeing as there is already one cup.
My theory is that each Horcrux will be different. So far there is:
an animal
an eating utensil
a personal object
a piece of jewelry
and possible a part of someone